Pump piston



Aug. 10 1926. 1,595,305

E. KIBELE PUMP PISTON Filed Nov. 24, 1924 Patented Aug. 1 0, 1926.

UNITED STATES EUGENE KIIBELE, OF

FUN]? Application filed November construction of piston body and packing whereby the force of the fluid being pumped will assist in maintaining a tight closure between the piston and the cylinder walls. The

means by which the removable packing.

means is retained in position also constitutes an important element in the invention.

Referring to the drawing herewith, Fig. 1 represents a broken central section through a cylinder showing a piston therein constructed' 'in accordance with my invention. Fig. 2 is a transverse section on the plane 22 of Fig. 1, and Fig. 3 is a broken view similar to that shown in Fig. 1 illustrating a slightly different embodiment of the in vention. Fig. 4 is a vertical section through a still different embodiment of the invention. Like'numerals of reference are employed to designate like parts in all the views.

In the drawing I have shown a piston mounted upon a piston rod 1, having a forward tapered end 2 adapted to fit Within the head 3 of the piston and a cylindrical end 4 to receive the follower plate 5 and the lock nut 6 threaded on said rod. The piston is adapted to work within the cylinder shown The oody 3 of the piston has a central tapered opening therein to fit upon the pis ton rod and is cylindrical on its outer surface except at the rearward end where it is formed with a flaring flange 8 projecting beyond the main body of the head. The flange 8 is beveled on its rearward end at 9 to allow the pressure exerted by the fluid to be ex erted under the rear end of the packing. ,An annular groove 10 is formed in the rearward face of the head as is common in this type of construction. The forward face of the flange 8 is rounded somewhat and undercut at 11 to overlie the packing member toassist in maintaining it in position.

The follower plate 5 is formed. in general construction somewhat like the flange 8, hav- 1,595,305 PATENT OFFICE.

PISTON.

a, 1924. Serial No. 751,814.

ing a forward beveled surface 9' and an undercut shoulder 11- to perform the same function as was recited relative to the said flange.

The packing member in this type of construction may be formed in two sections which are practically identical in construction as represented at 12 in the drawing. The outer ends of the packing sections are cylindrical and extend flush with the ends of the piston. Their inner ends contact with each other at 13. If desired, a spacing ring 14 may beplaced between the two sections, said ring fitting over the piston body and extending outwardly to a point approximately even with the outer face of the flange 8. Said spacing ring is wider at its outer side than it is on the inner side and acts to assist in retaining the packing rings in position, as will be obvious from the drawing. In the Fig. 3 embodiment, the spacer 15 1s formed upon a metal band or retaining ring 16, and may, if desired, extend flush with the outer periphery of the packing rings 12', instead of having the packing overlapping the ring, as in the Fig. 1 em-. bodiment. The retaining ring 16 contacts with the flange 8 and.the follower plate 5 so that no' movement of said ring is possible. Thus a somewhat firmer backing for the two halves of the packing ring is formed to prevent doubling back of the packing, and also the packing is held somewhat more securely in its seat due to the overhanging shoulder .17 provided at each side of the spacer 15.

- In Fig. 4 I have shown the packing ring 12 made in one integral piece without the spacing ring 14 as employed in the first embodiment. In other respects the com struction is identical.

In the operation of the piston the movement of the piston in either direction will cause an excess of pressure on the advancing face, the fluid thus being allowed to exert a pressure within the groove formed by the beveled face 9 or 9 pushing outwardly uporfthe packing ring and .thus forcing it firmly against the wall of the cylinder. The ring will be held securely in position by the overhanging shoulder at'll or 11' thus avoiding any danger of distortion of the packing means. It will be obvious that the expanding action of the fluid upon the packing will be the same in both directions of the movement of" the piston.

By this construction of piston it will be I clear that no portion of the body of the piston comes in contact with the walls of the cylinder and there will thereby be practically no wear upon the piston body, the friction being entirely upon the outer surface of the packing rings 12 and 12.. In the embodiment disclosed in Fig. 1 either or both of the rings may be removed and replaced by another without loss of time. Furthermore, the spacing ring will serve to more securely anchor the packing rings in position and will assist in holding the rin s against doubling back at the ends.

he advantages of the construction lie in the fact that the wear may take place only upon the packing and in the efficient means for maintainin a the ring and t e piston walls even after appreciable wear has taken place. A further advantage lies in the eflective means provided for quickly releasing and replacmg the packing when desired. The piston will therefore be simple and strong in construction, and effective in .its operation. The further objects and advantages of the device will be'clear to those skilled in the art without further description.

What I claim as new, and desire to protect by Letters Patent is:

1. In a pump piston, a piston body, a radial flange thereon at one end, a follower tight contact between plate at the other end, overhangin shoulders on said flange and plate incline toward each other, a packing ring shaped to fit between said flange and plate, said ring being of greater external diameter than said flange and plate and extensions on said ring overlying said flange and ring in the mannerdescribed.

2. A pump piston having a central annular seat, a cylindrical packing ring of flexible material thereon, co-engaging means on said ring and piston to resist outward movement of said ring and retain said ring in position, longitudinally extending ends on said ring overlying the piston, said piston having beveled ends to allow entrance of fluidbeneath said extensions,

3. A pump piston having a piston body,

a radial flange at one end thereof, a follower plate at the other end thereof, a packing ring between said flange and plate, a spacing ring of rigid material centrally of the length of said packing ring, said spacing ring being of greater thickness on its outer diameter, said packing ring overlying said spacing ring and acting to space said piston body from the walls of the cylinder in which it works.

In testimony whereof I hereunto aflix my signature this 17th day of November, A. D.

.EUGENE KIBELE. 

